Special designs of nozzles or tuyeres are used in high-temperature units treating metal scrap for blowing gaseous technological media into the melt below the bath level. The higher technology utilisation of media is achieved by the blowing of media into the melt below the bath level. Due to the momentum of the discharge stream, which flows directly into the melt, the melt is set into intensive motion, which is very advantageous especially from the point of view of both temperature homogenization and homogenization concerning the chemical composition of the bath. The structural design of the majority of these tuyeres considers one or more channels composed of steel tubes or formed directly in the basic refractory material of the tuyere. From the point of view of structural design of these tuyeres, it is very important to know the dependence of exit parameters of blown media on the design parameters of the tuyere, in short on boundary conditions. The contribution contains division of and requirements for tuyeres and also description of chosen results of mathematical modelling of gaseous media flow through a channel with given dimensional parameters.Keywords: mathematical simulation, homogenisation, tuyeres, gas blowing
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